Related Experiment Videos
On the precision of automated activation time estimation
D T Kaplan1, J M Smith, D S Rosenbaum
1Harvard-MIT Division of Health Sciences and Technology, Cambridge, Massachusetts 02139, USA.
Computers in Cardiology
|January 1, 1988
Summary
Optimizing electrogram analysis, a matched filter algorithm combined with sinx/x interpolation significantly improves the accuracy of local activation time (LAT) estimation in cardiac electrograms, even at lower sampling rates.
Area of Science:
- Biomedical Engineering
- Cardiac Electrophysiology
- Signal Processing
Background:
- Accurate estimation of local activation times (LAT) from electrograms is crucial for understanding cardiac electrical activity and diagnosing arrhythmias.
- Traditional methods can be sensitive to sampling rate, noise, and interpolation techniques, impacting diagnostic precision.
Purpose of the Study:
- To evaluate the impact of sampling rate, signal-to-noise ratio (SNR), and sinx/x interpolation on LAT estimation accuracy.
- To compare the performance of different algorithms, including dV/dtmax and matched filter detection, for fiducial point localization in electrograms.
Main Methods:
- Utilized dog myocardial electrograms (epicardial and endocardial) from normal and infarcted regions.
- Adjusted SNR by adding colored white noise to mimic experimental noise characteristics.
- Employed dV/dtmax and matched filter detection algorithms for fiducial point estimation.
- Investigated the effect of sinx/x waveform interpolation on LAT precision.
Main Results:
- The matched filter detection algorithm demonstrated superior precision in reproducible fiducial point localization compared to dV/dtmax, especially at typical SNRs and sampling rates.
- sinx/x interpolation provided a significant additional improvement in LAT estimation accuracy.
- Combining the matched filter algorithm with sinx/x interpolation allows for accurate LAT determination even with digitization rates below the Nyquist rate.
Conclusions:
- Matched filter detection coupled with sinx/x interpolation offers a robust and precise method for LAT estimation in cardiac electrograms.
- This combined approach enhances the reliability of electrogram analysis and may permit reduced digitization rates without compromising diagnostic accuracy.